76.

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83.

To satisfy the sampling theorem, a 200 Hz sine wave should be sampled at :
(A) 100 Hz (B) 200 Hz
(©) 400 Hz (0) 20 Hz

1൩ Frequency modulation :
(A) amplitude of the carrier remains same
(B) frequency of the carrier varies in accordance with the modulating signal
(C) the no. of side bands are infinite
(D) allof the above

Optical fibers are highly immune to EMI. Which one of the following statement justifies it?
0) ‘They transmit signals as light rather than electric current.
(1) They are shielded by outer conductors in cable.
(iii) Magnetic fields cannot penetrate through the glass of the fiber.
(^) @ only ൯ 0) and (ii) only
)© Allof the above (D) None

What type of joining technique is used for fiber optic cables?
(A) Soldering technique (B) Fusion technique
(C) Welding technique (D) Epoxy technique
Which light source is used for long distance and high data rate applications in fiber optic
communication?
(A) PIN Diode (B) Photo Diode
(C) Light Emitting Diode (D) Laser Diode

Which device is used to convert a physical quantity into its corresponding electrical signal?
(A) Amplifier (B) Transducer
(C) Modulator (D) Oscillator

Which sensor detect the presence of objects without any physical contact?
(A) Strain gauge (B) LVDT
(C) Load cell (D) Proximity sensor

Which device is used to convert force into electrical signal?
(^) Load cell (B) Thermocouple
(೮) Thermister (D) LVDT

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